Process of manufacturing an iron alloy for dynamo-electric purposes.



. tained, for example,

by obtains a small UNITED STATES PATENT OFFICE.

WALTER RI IBEL, 0F WESTEND, NEAR- BERLIN, GERMANY.

PROCESS OF MANUFACTURING AN IRON ALLOY FOR DYNAMO-ELECTRIC PURPOSES.

No Drawing.

purposes consisting of iron technically free phosphorus and manganese, and of a corresponding admixture of copper,

from silicium,

as described in a prior patent application. The iron to be used for the new alloyis ohby the combination of process. Now it has been found that it is not possible by simply combining the two mentioned processes to obtain a suitable raw material for the manufacture of dynamo sheet. If the process is practised in the manner usual heretofore, after removing the sulfur and phosphorus as well as the silicium, manganese and carbon the bath is completely superoxidized. By adding silicium-iron or manganese-iron deoxidization and a certain recarburization is brought about. The iron, however, thereaddition of silicium and generally amounting to 0.3-

an acid and a basic manganese 0.4 place the iron would remain red short and could not be worked up further. As the iron according to the known process is to be technically free from silicium, phosphorus, manganese and carbon it Was necessary to seek another deoxidizing agent which, however, might impair neither the amount of loss nor the magnetizability of the copperiron. Now I have found that for this purpose the group of the alkali earth metals (in which group I mean to include magnesium) and metals related thereto are especially suitable. Complete deoxidization is obtained with calcium, barium, strontium Specification of Letters Patent.

If the deoxidization did not take Patented Mar. 2, 1915.

Application filed July 9, 1912. Serial N 0. 708,479.

and magnesium, and even if residues of these metals do remain in the copper-iron the same nevertheless retains its good magnetoelectric properties. The amount of loss is indeed rather less when a small portion of the deoxidizing metal remains in the bath. In order to obtain the requisite effect it is sufficient to use a quantity of the alkali metal, e. g. calcium, equal to 4% of the copper to be employed, but the same quantit as the copper would not be injurious. Pre erably, the deoxidizing metal to be employed -is added in pieces in the form of an alloy With copper or other suitable metal to the purified and superoxidized iron bath. In this manner it is possible not only to make an iron almost completely free from silicium, manganese, phosphorus and carbon, but also any other desired iron alloy With any other meta As copper must be added to the iron in any event in the known process above referred to, the addition of the earth alkalis or magnesium is made in the form of copper alloys of the mentioned admixtures.

claim 1. The process of manufacturing alloys for dynamo sheet, which comprises deoxidizing purified and superoxidized iron by means of a small quantity of an earth alkali metal and forming the desired alloy of the 11'01'1.

2. The process of manufacturing copperiron alloy for dynamo 'sheet, which comprises deoxidizing purified and superoxidized iron by means of an earth alkali metal added in the form of an alloy of copper, whereby the desired alloy is formed.

In testimony whereof, I have signed my name to this specification in the presence of two witnesses.

WALTER RUBEL. Witnesses:

OSKAR GLOKSTEIN, HENRY HASPER. 

